Characium Sieb o ld i. Br. Alg. Urdc. 32 t. 3 ,f. A. 1-21.
Cells erect, equal, at the beginning nearly lanceolate, when
older pyriform or obovate, 2-3-4 times longer than broad, apex
obtuse or broadly rounded ; stem short, hyaline, base attenuated,
truncate, not discoid; contents bright green or yellowish-
green, granular, in the beginning with a single amylaceous
granule, afterwards with several.
S iz e . Cells •022-'026 mm. diam.
Eabh. Alg. iii. 83.
In clear water, attached to filiform algie. Bangor (IT.
Joshua).
“ The gonidia of this species exhibit, after they have already attached
themselves by their ciliated extremities, a tremulous motion lasting for
almost a quarter of an hour, and evidently commencing in the delicate
stalk.”—Braun p. 230.
Plate XX. fig. 9. Cells in various stages, in situ, X 400 ; 10, cells
containing mature zoogonidia ; 11, free zoogonidia.
Chaiacium o rn ithoc ephalum . Br. Alg. Unic. p. 42, t. 3 0 .
Cells from the beginning unequal, incurved, distinctly stipitate,
afterwards one side swollen, semilunate, apex produced
into a straight or inclined beak ; stem elongated, slender, base
sometimes discoid ; cell-contents bright green, granular, with a
central or lateral starch granule.
S i z e . C e l ls •025--083 m m . lo n g , w i t h o u t s tem , h a l f a s w id e ,
o r m o r e .
Micr. Journ., 1867, p. 85. Rabh. Alg. iii. 86.
In pools.
Plate XIX. fig. 5. a, young cells; d, cell further advanced ; b, e, f,
mature cells in different stages of division ; e. mature cells with eu-
doohrome artificially contracted, all magnified 600 diameters.
Chazacium t e n u e . Herm. in Babb. Beitr. p. 26.
Cells erect, narrowly lanceolate, six times as long as broad,
attenuated towards each extremity, somewhat rostrate, and
hyaline above; stem short, slender, not dilated at the base ;
contents homogenous, bright green.
S iz e . Cells 'OOd-'OOb mm. diam.
Mior. Journ., 1866, p. 126, 193.
Characium ambiguum, var. c., Rabh. Alg. iii. 87.
Attached to filamentous alg».
Plate X IX . fig. 4. Cells magnified 400 diameters.
G en u s 35. HYDRIANVM. Babh. (1864.)
Cells as in Characium, but cell-contents at the beginning
homogenous, afterwards contracted into a dark green ovoid
corpuscle, from which, by oblique division, 2-4-8 biciliate zoogonidia
are produced, which escape by a terminal aperture.—
Eabh. Alg. Eur. iii. 87.
H y d z ia n um h e te z om o z p h um . Beinsch contrib. p. 80.
Cells at first globose-elliptical, attenuated below into a tliiii
hyaline stem; contents granular, then contracted in preparation
for formation of the gonidia; zoogonidia elongated, escaping
at the broadly opened apex.
S iz e . Cells, unopened, '008-'0095 mm. b ro a d ; opened
c e lls -0066 X -02 mm. or, + n
Reinsob Contributiones ad Algologiam ( 1 8 l4 ) p. 80, t. l i ,
fig. 3.
Attached to filamentous alg®.
Plate X IX . fig. 6. a, cells in different stages attached to a filamentous
alga maguified 400 diameters ; 6, young cells ; c, mature cells magnified
800; il, cell with zoogonidia escaping, and maguified 1200 diameters ; e,
zoogonidia farther magnified.
Genus 36. CODIOLUM. Braun. (1852.)
Cells at first obovate, as tbey grow older becoming clavate,
or nearly cylindrical, densely aggregated in tufts, base attenuated
into a s tem ; cell-contents green, delicately granular, mixed
with numerous starch granules. Propagation by zoogonidia,
and also by resting spores (hypnospores).—Rmiia TJnic. Alg.
p . 19.
C o d io lum g z e g a z ium . Br. Alg. Unic. p. 20.
Cells elongated, subclavate, green; many times longer than
the diameter, apex rounded.
Siz e . Cells -08 mm. diam.
Eabh. Alg. iii. 90.
On maritime rocks (E . M. Holmes). Also in the drip of
fresh water.
Some persons contend that this is only a marine plant, others that it
occurs also in the neighbourhood of the coast, but either in mstuariea
or entirely removed from salt water. We inclnde it here without preju-
dice to either opinion.
Plate XX fig. 1, 2, 3, young p lan ts; 4, 5, further developed plants ;
6, mature plants X 300 diameters, one containing starch granules, the
other mature zoogonidia ; 7, 8, zoogonidia.